# Civil Engineering - UPSC Civil Service Exam Questions

31.

Which type of plume may occur during winter nights ?

 A. Looping B. Inversion C. Coning D. Lofting

Explanation:

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32.

In a compaction test on a soil sample, if the compaction energy is decreased (γd = maximum dry density, OMC = optimum moisture content)

 A. γd will increase with increase in OMC B. γd will decrease with increase in OMC C. γd will decrease with decrease in OMC D. γd will increase with decrease in OMC.

Explanation:

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33.

A three-hinged symmetric parabolic arch is hinged at the springing and at the crown. The span and rise are 40 m and 10 m respectively. The left half of the arch is loaded with U.D.L. of 3 t/m. The horizontal thrust at the springings will be

 A. 15 t B. 20 t C. 30 t D. 40 t

Explanation:

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34.

At a hydraulic jump, the depths at the two sides are 0.4 m and 1.4 m. The head loss in the jump is nearly

 A. 1.0 m B. 0.9 m C. 0.7 m D. 0.45 m

Explanation:

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35.

A 12 kg mass rests on a surface for which the coefficient of friction is μ= 0.15. What is the smallest force that can give the mass acceleration of 3 m/s2 ? (Take g = 10 m/s2).

 A. 120 N B. 100 N C. 65 N D. 54 N